This 1998 relic asks a question modern anime won't touch: what if Earth was already dead, and these kids are humanity's last argument with extinction? The world-building is patient, deliberate, sometimes glacially slow, but it trusts you to sit with the strangeness of a polluted Earth, child labor systems, and a substance called DT that rewrites what it means to be human. Animation budget this thin would sink anything else, but the concept is strange enough to carry you through 26 episodes of asking what Zero actually wants and whether Shu can survive knowing the truth.
Shu escapes a labor-driven dystopia when he crosses paths with the Returners, a resistance faction bent on dismantling the system that enslaves children. What begins as a bid for freedom transforms into something far larger: a war over DT, a mysterious substance flowing through human veins that grants extraordinary power to whoever can weaponize it. Zero and his forces hunt Shu relentlessly, convinced the boy holds the key to controlling DT and reshaping the world order. Caught between survival and revolution, Shu must confront the reality that freedom comes with a price, and his allies may harbor secrets as dangerous as the enemies closing in. The series weaves sci-fi action with the moral weight of resistance, asking whether violence in service of liberation can ever be justified. Expect mechanical combat, political intrigue, and a protagonist forced to grow up fast in a world where childhood is a luxury nobody can afford. This is sci-fi that treats its stakes seriously, grounding high-concept premise in the human cost of systemic oppression.